#include <stdio.h>
/*
 * try compiling with:
  gcc main.c
  gcc main.c -DGOLDFISH
 */
int main() {
  char *message = (void *)0;
#ifdef GOLDFISH
  printf(message = "Hello, goldfish!\n");
#else
  printf(message = "Hello, world!\n");
#endif
  printf("message: %s\n", message);
  return 0;
}
